Hey, no not tried cl5 on am3....I have on other intel platforms, for me cl5 was not faster and was little more stressful. There been all sorts of tricks I've seen over the years cl5 and twcl8, it can look good but not efficient. On haswell I've compared cl6-twcl6 vs cl5-twcl6 at 2800mhz and was very close to the same times
next time I have ln2 and run am3 with ln2 memory I try it and post up, never know amd might like it lol